What is a kinetochore?

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Question

(D) kinetochore is a complex protein structure that forms on the centromere of a chromosome during cell division. It serves as the attachment point fo

Vedclass · Accepted Answer

All of the above.

Vedclass · Answer

(D) kinetochore is a complex protein structure that forms on the centromere of a chromosome during cell division. It serves as the attachment point for spindle fibers (microtubules) to pull the sister chromatids apart during anaphase. Since the kinetochore is located on the surface of the centromere and facilitates the attachment of spindle fibers,options $A$ and $B$ are correct. Option $C$ is also a functional description of the centromeric region where the kinetochore is situated. Therefore,all the given statements correctly describe aspects of the kinetochore.

List-$I$	List-$II$
$(a)$ $S$ phase	$(i)$ Proteins are synthesized
$(b)$ $G_2$ phase	$(ii)$ Inactive phase
$(c)$ Quiescent stage	$(iii)$ Interval between mitosis and initiation of $DNA$ replication
$(d)$ $G_1$ phase	$(iv)$ $DNA$ replication

Column $-I$	Column $-II$
$(a)$ Synapsis aligns homologous chromosomes	$(i)$ Anaphase$-I$
$(b)$ Synthesis of tubulin protein	$(ii)$ Zygotene
$(c)$ Action of enzyme recombinase	$(iii)$ $G_2$-phase
$(d)$ Centromeres split and chromatids move towards opposite poles	$(iv)$ Anaphase$-II$
	$(v)$ Pachytene

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